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In the arrangement shown in figure, the ...

In the arrangement shown in figure, the ends `P` and `Q` of an unstretchable move downwards with uniform speed `U`. Pulleys `A` and `B` are fixed. Mass `M` moves upwards with a speed

(a) `2U cos theta` (b) `(U)/(cos theta)` (c) `(2U)/(cos theta)` (d) `U cos theta`

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